Item stack duplication by cheat clients using only a single shulker box

Player was spotted demonstrating to another player, using nothing but a skulker and a single item.

Duplication was verified by using /data to inspect the players inventory and shulker throughout the demonstration, and spectating for the duration.

1. Place shulker

2. Place item stack to be duplicated in shulker

3. Break shulker box while shulker box inventory is open (requires cheat client?)

4.Take item stack out of shulker box just prior to the block breaking

5. Item stack is now both in player inventory and shulker box floating item